Mold-cutting mechanism



ug; E9 ,1924.-

A. L. BREITENSTEIN MOLD CUTTING MECHANISM Filed June l5, 1,9122 4 Sheets-Sheet 2 l tu? 7 www@ Aug. 19, 1924i.v

A. L. B REITENSTEIN MOLD CUTTING MECHANISM Filed Ju-n 15 1922 Sheets-Sheet 5 n "illd m ug. i9 1924.

A. L. BREITENSTElN MOLD CUTTING MECHANISM Fild June 15, 1922 4 sheets-sheet 4 61H0: ma

'Parenteel nag, ie, ieee.

narran stares 'ARTHUR L. BnnrTENsTEi-N, or AKRON, oHIo.

MOLD-CUTTING- MECHANISM.

Application led .Tune 15, 1922. Serial No. 568,377.

To aZZ'whom 'it may concern.'

Be it known that l, ARTHUR L. BREITEN- sTnrN, acitizen of the United States, residin at Akron, in the county of Summit, State of Ohio,4 have invented certain new and useful Improvements in Mold-Cutting Mechanism,l of which the following is a specification.

My invention relates, broadly, to mechanism for cutting designsin annular molds,

such, for instance, .as those used in forming non-skid patterns upon the tread surface of resilient tires.

Machines for cutting or ,engravin tire mold rings have heretofore been available, but'so far as I 'am aware, such machines have been designed for operating upon molds for pneumatic tires, and are not adaptable for use in conjunction with molds for use with tires having a comparatively fiat tread surface such as those of the cushion or solid variety. Prior to my invention, the operation of producing a design upon molds for solid or cushion tires having transversely fiat tread surfaces has been performed entirely by hand which 4is laborious and time consuming inthe extreme, or such molds have been provided with molded matrix sections which are ditlcult to`produce with such accuracy of design lthat they can be properly aligned in annular form` within the mold. Furthermore, the production of such matrix plates by moldln iS expensive, requiring, as it does, specia apparatus and operators skilled in the use thereof.

It is the primary purpose of the present invention to provide a practical form of mechanism for cutting, or en aving, either the inner surface of molds aving a substantially flat transverse surface, or: for performing this operation upon the matrix plates of all types of molds.

It is a particular object of the invention to provide a form of mechanism for use in effecting the above described operation upon the matrix plates of a mold that is adapted to produce a substantially fiat tread surface upon a tire and roulded edges upon each sideof the tread surface, although the principle of the invention may be used in the engraving of rings with other surfaces, if

desired.

The invention also seeks to provide a out ting mechanism through the use of which a unit cfa pattern may be reproduced a number of .times around an annular object without stoppinfr the mechanism or resetting any part thereo Another object of the invention is to provide a mechanism adapted forV the above purposes that operates on the principle of a pantograph, whereby the pattern upon the mold is reproduced at a reduced .scale as compared with a tool controlling element that embodies a unit of the pattern.

Qther objects and vadvantages will, in part,becom`e apparent, and, in part, be set forth in detail, as the following description is read in the light of the accompanying drawings which form a part of this specification.

In the drawings:

Figure 1 isa front elevation of an apparatus constructed 'in accordance with my invention; n y

-Fi re 2 is a sideelevation looking at the r1ght side of Figure 1; p f

Figure 3 is a sectional view, on an enlarged scale, taken on the iliine 3 8 .of Figure l;

Figure 4. is a sectional view, on an enlarged scale, taken on the line 4-4 of.

Figure' 1;

Figure 5 is a view partly in elevation and part y in section, drawn to an enlar ed scale and illustratlng a cutting tool hol er, used in the practice. of my invention, and certain detail parts associated therewith;

Figure 6 'is a horizontal section, on the line 6 6 of Figure;

Figure 7 is an elevational view, on an enlarged scale, of a slide upon which the tool holder is carried;

Figure 8 is a detail of the tool controlling element; and

Figu

re 9 is a view of aportion of a ma- 'trix plate showing one deslgn that may be cut thereon through the use of apparatus.

The mechanism of my invention, briey desc-ribed,in its preferred form, comprises a base. portion, designated l inthe drawings, which supports a work holder 2, a tool carriage 3 and a tool controlling element 4, all of which will now be described in detail. 1 ,4

The .work holder 2 is located at one side of the centerline of the base 1 and com-l prises an annulus 5 supported for rotation upon a frame 6 by means of roller'bearings my novel coV 7, the armulus being open at one side thereof to receive a mold, or a series of matrix plates, one of which is shown 1n section and in proper position upon the annulus at '8.

The type of plate shown in the drawing is them against a radial ange 10 that is pro! vided upon the holder 2. Any suitable arrangement of devices for centering the assembled matriX plates 3 relative to the hold' er 2 may be utilized. Plates of the character f shown are usually provided with a trans- I the work holder may be rotated.

versely inclined outer face, as shown at 11, and therefore wedges 12 that are adjustable transversely of the holdermay bel advantageously utilized in the manner illustrated in the drawings. In this instance, the Wedges each carry a screw 13 which engages in a suit-able opening 14 in the forward edge of the holder 2 whereby the wedges are adapted for individual adjustment between the inner face of the holder 2 and the outer inclined face 11 of one of thev plates 8. By using wedges of different sizes and constructions, the matrix plates for molds. of different sizes may be centered and clamped upon the holder 2, as will be apparent without further explanation. y

Upon the outer face of the holder 2 and preferably centrally thereof, an annular rack 15 is -provided which'is engaged by a toothed pinion 16 that is fast'upon and adjacent one end of a manually rotatable shaft 17. The end of the shaft 17 that carries the pinion 16 extends transversely of the holder 2- and is journaled, beneath said holder, inthe frame 6 and in vertical alignment with the center of thel holder as will be seen by reference to the drawings. Ad jacent its opposite end, the shaft 17 is journaled in a bearing 18 that is mounted at the edge of the base 1 remote from the holder 2. Anextended portion 19 of the shaft projects beyond the bearing and is equipped, at its extremity, with a hand wheel 20 by means of which .the shaft and l At the rear of the base 1 and to one side vof the work holder 2, a standard 21 is mounted, that is provided upon its side face adjacent the holder with vertical guides 22 and upon its front face with a vert-ical slot 23. A bracket 24 is arranged upon thevv guides 22 for adjustment thereon. Any suitable devices may be provided for adwhile the other end thereof projects over and beyond the hand wheel 20. The member 27, as, will be seen from the foregoing description, is adjustable vertically of the standard 21 and in a plane offset from the vertical center of the work holder. In order to* lock the member 27 against vertical movement, headed bolts 24a are provided thereon in position to pass through the slot v23 in the standard 21.

Upon the forward face of the member 27, va pair of parallel spaced guide rails 28 are provided, one above the other, as best show-n in Figures 3 and 4, in position to extend substantially the entire length of said member. ject through the work holder 2 serve to support the tool carriage 3, previously mentioned, for sliding movement thereon, as best shown in Figures 1 and 5v.

The tool carriage 3 is relatively short as compared with the member 27, and is provided adjacent one end thereof with vertical guides 30 between which a tool holder is mounted for vertical movement. relative to the carriage by devices presently described. The tool holder, in this instance, comprises a slide 31 having a cylindrical portion 33. lVithin the cylindrical portion 33 a construction is preferably utilized thatcomprises an outer casing 34 adapted to support for rotary movement therein a tool chuck 35 having a spindle 3G. Any suitable form of tool may be employed in connection with the chuck 35, such as that indicated at 37. The casing 34, as will be seen byreference to Figure 5, is provided with a rack 38 which is engaged by a toothed pinion 39 operated by a hand wheel 40, and a stop 41 is provided on said casing that projects through a slot in the cylinder 31. By means of this construction, the tool 37 may be adjusted relative to the slide- 31 to initially position it against the work and to gauge the depthof the cut as desired.

Y Means for clampingthe tool in adjusted position relative to the slide 31 are provided in the form of clamping nuts 42 which may be drawn together by means of the hand wheel 43 and Screw bolt 44 to hold the casing 34 against movement. The tool spindle 36 is'provided with a splined pulley I45 that is driven by a belt 46, as shown in Figures 1 and 2.. Suitable idlers 47 are The ends of the rails that thus promodera against the lower face-of the upper rail 28.

This rack 49 is engaged and moved by a toothed pinion 51 fast upon a vertical shaft 52 that: is journaled in the member 27 and rotated by a hand wheel 53. A slot 54 is cutl in the member 27 through which said pinion 51 projects. The lower end of the shaft 52 carries a second toothed pinion 55 of larger diameter than the pinion 51. The pinion 55' meshes with a rack 56 suitably secured upon the rear face of a slide 57 that is suspended upon the lower rail 28 for movement'rlongitudinally thereof. The slide 58 carries at one end thereof a vertically disposed adjustable pin 59 that engages a pattern roll which constitutes the before mentioned tool controlling element 4.

The pattern roller is journaled for rotation about a horizontal axis between spaced brackets 61 that project from the lower edge of the member 27` and beneath the slide 57 and has the pattern formed thereonin suchl manner that the pin 59 travels in slots or grooves corresponding to the design that is to be cut in the matrix plates. The pattern .roll is designed to be rotated simultaneously with the work support, but at a faster speed whereby the design is cut in the .plates 8 lon a reduced scale as compared with its size upon the roll 4. The means forsecuring this diiferent ratio of speeds in the rotation of the workholder and the pattern roll comprises a large gear 62 upon the extension l19 of the shaft 17 which drives a smaller gear 63 fast upon one end of the roll 60, the two ears being connected for driving relation y means of an idler gear 64 that is carried upon a pivoted bracket 65.. The bracket 65 is journaled for swinging movement upon the shaft l17 so that it may be adjusted and different sizes of gears substitutedl for thegears 62 and 63 for the purpose of changingv the ratio of speeds of the workholder 2 .and the roll 60. By this means the operator may determine the scale at which the pattern upon 'the roll 60 will be reproduced upon the matrix plates and adjust the mechanism to reproduce the pattern the correct number of times in accordance with the circumference ofthe work being operated upon.

As the work holder 2 and the pattern roll are rotated, the operator, at'the same time,

feeds the tool carriage 3 and hence the tool 37 lom the face of the tool car- Iover ythe work by following the pattern upon the roll 60 with the pin 59. By virtue of the arrangement of the gears 51 and 55 and the manner of mounting the slide 57, the pin may be moved to follow the attern upon the roll and at the same time t e carriage 3 is controlled thereby to move at a slower speed. rthis latter feature, i. e., that of reproducing the pattern at a reduced scale from a larger pattern' and through means 1n` clnding a rotating roll, `insures against imperfections in the larger pattern being.l reproduced on such-A a scale that they will be obvious to the naked eye. By the arrangement described, itis possible to reproduce the pattern on the mold as often as desired without stopping to reset the machine. This is a. considerable improvement over prior engraving machines which have required a resetting of the work after a pattern was reproduced once in the mold.

Means are provided for automatically ad'- justing the tool 37 to',` follow the curve 9 of the anges 8 upon the work when the tool 37 reaches either edge of the plate and comprises the following which may also be used for obtaining other curvatures in the work, provided the parts are designed accordingly.

An oscillating segment 66 is. pivoted, as at 67 to the carriage 3, and- .is provided at one end with teeth 68 meshing with a rack 69 suitably affixed to the tool holder'31, as shown in Figures l and 5,. A roller 70 is rovided upon the segment which is engaged by a rotary cam member 71v having a high portion 72 and a concentric periphery 73.

lThe cam is bolted, as at 73a, upon a rotary that is journaled in a bracket 74a arisingvfrom the top edge of the carriage 3 whereby they travel with the carriage during the cutting operation. During such operation the cam and holder are rotated by means of a toothed pinion 75, fast upon one end of the shaft 74, and in mesh with an elongated rackv 76 that is suitably a-Hixed to the member 27 in the manner shown in Figures 1 and 4 of the drawings. The cam 71 is-"so constructed that the high portion 72 thereof engages the roller 70 of the segment66 and rocks said segment to lift the tool holder 31 in the guides 30 of the carriage as the tool reaches either curve 9 'of the flanges 8. Also it is so timed in its operation and with relae' tion to the movement of the carriage that the -form depth across the work `or plates 8.v However, other forms of cams may be substituted for that shown whereby the tool may stood. Also other pattern rolls 4f may be aiY substituted for that shown and the ratio j of speed of the slide 57, and the carriage 29 changed by the use of different gears for the gears 5l and 55.

The operation of my invention, it is believed, will be clear from the foregoing and therefore further description thereof is n-ot deemedvnecessary herein.

Although the invention has been described in detail, and certain specific terms 'utilized herein, it is to be understood that the present disclosure is illustrative and is therefore not to be considered as limiting the scope or spirit of the invention unless such limitations are specified in the'claims appended hereto.

What I claim is:

1. Mechanism for engraving annular objects comprising, a rotatable support for the object, la rotatable element having a pattern thereon, means operable to eect a dierential rotation of the support and'th element, a tool carriage having a tool .the eon said carriage being operable to traverse the object, and means adapted to control the operation of the carriage in accordance with the pattern upon' said element.

2. Mechanism for engraving annular objects comprising, a rotatable support for the object, a rotatable element having'a pattern thereon, means operable to eect simultaneous rotation of the'element and the support, a tool carriage, a tool mounted on thec'arriage to be movable thereon, said carriage being operable to traverse the object, means adapted to control the operation of the carriage in accordance with the pattern on said element, and means for automatically moving the tool relative to the carria e.

A machine for engraving` annular objects, comprising a rotating holder for the object, a tool movable transversely ofthe object, a pattern and a pattern follower, and reduction gearing between the pattern and the holder on the .one hand and the pat- I tern follower and the tool on the other.

4. Mechanism for engraving annular objects comprising, a movable support for the object,a movable element having a pattern.

thereon, a tool, a tool carriage operable to move the tool over the object, means open' able to-eifect differential movement of the support and the element, and means for au- 'and theelement, and means for effecting the reproduction of the pattern on a smaller scale relative to the scale of the pattern on said element.

6. Mechanism for engraving annular objects comprising, a movable support for the object, a'movable element having a pattern thereon, a tool operable to reproduce saidl 'pattern on the object, means operable to effect differential movement of the support and the element, means for effecting the reproduction of the pattern on a smaller scale relative to the scale of the pattern on said element, and means for automatically moving the tool toward and away from the axis of the object.

7. Mechanism for engraving annular objects comprising, a rotatable support for the object, a rotatable element having a pattern thereon, means operable to simultaneously rotate the support and the element, a tool carriage, a tool upon the carriage, a pattern follower for connecting the carriage with the element, and means operable to simultaneously move the carriage and follower at different speeds. Y

8. Mechanism for engraving annular objects comprising, a rotatable support for the object, a rotatable element having a pattern thereon, means operable to effect dierential rotation of the support and the element, a tool carriage, a tool upon the carriage, a pattern follower for connecting the carriage and the element, and means operable to simultaneously move the carriage and follower at different speeds.

9. Mechanism for engraving Aannular .objects comprising, a rotatable support for the object, a rotatable element having a pattern thereon, means operable to edect differential rotation of the support andthe element, a tool carriage operable to traverse the object, a tool mounted upon the carriage for movement relative to the carriage, a pattern follower for connecting the carriage and. the element, means operable to simultaneously move the carriage and follower at differentspeeds,a1id means for automatically moving the tool relative to the carriage as said carriage traverses the object.v

1,0. Mechanism for engraving annular objects comprising, a rotatable support for the object, a rotatable pattern roll, a common driving mechanism operable to -eEect diierential rotation of the roll and the support, a tool carriage, a tool upon the carriage adapted for movement relative thereto, a

pattern follower for connecting the carriage llO a tool carriage, a tool upon the carriage A' adapted for movement, relative thereto, a

pattern follower for connecting the carriage and the roll, means operable to simultaneously move the4 carriage and the follower atdiferent. speeds, and means for automatically moving the tool relative tothe carriage.

jects comprising, a rotatable support for the object, arotatable element havinga pattern thereon, a'common driving mechanismop'-,

erable to effect differential rotation of the support and the element, a tool carriage, a tool upon the carriage, a pattern follower for connecting the carriage and the element,

erable to effect differential rotation of the support and the roll, a toolA carriage, a'tool support upon the carriage, a tool adjustably mounted in the support, a follower for connecting the carriage and the roll, and a com- Amon driving mechanism operable to move the follower and carriage at different speeds.

14. Mechanism for engraving annular ob- 1 jects comprising, a rotatable support for the object, a rotatable element having a pattern thereon, a common driving mechanism operable to effect differential rotation of the support and the element, a tool carriage, a tool support upon the carriage mounted to reciprocate thereon, a tool mounted upon the support, a follower for connecting the carriage with the rotatable element, means operable to move the carriage and follower at. different speeds, and means for automatically moving the tool support upon the carriage. 1-

15. Mechanism for engraving annular objects comprising, a rotatable support for the object, a rotatable element having a pattern thereon, means operable to simultaneously rotate the support andthe element, a tool carriage, a follower for connecting the car- 12.` Mechanism for engraving annularv obriage with the element, means operable to simultaneously move the carriage and the follower at different speeds, a recprocatory tool support upon the carriage, a tool mounted upon the support, and means for automatically .reciprocating the support.

16. AA Amachine for engraving the inner surface of annular rings comprising, a tool carriermovable parallel to the axis of the" ring, a tool holder mounted on said carrier and movable at an angle tothe carrier, and means governed by the movement of the carrier and independent of the pattern for moving the tool holder thereon.

1,7. A machine for engraving the inner surface-of annular rings comprising, a tool carriage movable parallel to the axis of the ring, a tool holder slidably mounted on the v carriage at an angle tothe movement thereof, a rotary cam on the carriage for controlling the movement of the tool holder, and

means to rotate the cam by movement of the carriage.

18. A machine for engraving the inner surface of annular rin s comprising, a holder for the ring, a rol having a pattern thereon, means Vfor simultaneously rotating the holder and the'zroll, a tool carriage, movably axially ofthe ring, a tool holder on the carriage movable toward and away from the axis of the ring, a pattern follower on said carriage, -p and means for simultaneously moving the carriage and the tool holder.

19. In a machine for engraving annularobjects, a movable carriage, a pattern and a pattern follower to control the movement'of the carriage, a tool slidably mounted inthe carriage, and means independent of the pattern and pattern follower to raise and ower the tool during the operation of-the carriage. I

20. In a machine for engraving annular objects, a pattern controlled carriage movable transversely of the object, a tool slidably mounted in the carriage and movable toward and from the axis-of the object, and automatically actuated means lindependent of the pattern to-control, the sliding movement of the tool.

ARTHUR L. BREITENSTEIN. 

